Android实现网络音乐播放器

淡淡的烟草味﹌ 2022-07-28 10:57 275阅读 0赞

### 本文是一个简单的音乐播放器 ###

### 布局代码 ###

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.zj.music.MainActivity">
    
        <ProgressBar
            android:id="@+id/song_progress_normal"
            style="@style/Widget.AppCompat.ProgressBar.Horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="top"
            android:maxHeight="5dp"
            android:progress="30"
            android:tag="tint_accent_color" />
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/song_progress_normal"
            android:orientation="horizontal"
            android:gravity="center_horizontal"
            >
            <ImageView
                android:id="@+id/previous"
                android:clickable="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/btn_playback_previous"/>
            <ImageView
                android:layout_marginLeft="20dp"
                android:id="@+id/start"
                android:clickable="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/start"/>
            <ImageView
                android:id="@+id/pause"
                android:clickable="true"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                />
            <ImageView
                android:layout_marginRight="20dp"
                android:id="@+id/stop"
                android:clickable="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/stop"/>
            <ImageView
                android:id="@+id/next"
                android:clickable="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/btn_playback_next"/>
    
        </LinearLayout>
    </RelativeLayout>

### java代码实现 ###

package com.zj.music;
    
    import android.media.AudioManager;
    import android.media.MediaPlayer;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.widget.ImageView;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
        
    
        ImageView pause;
        ImageView start;
        ImageView stop;
        ImageView previous;
        ImageView next;
        boolean isPlaying=false;
        String filepath="http://10.129.69.114:8080/music";
        MediaPlayer mediaPlayer;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            pause= (ImageView) findViewById(R.id.pause);
            start= (ImageView) findViewById(R.id.start);
            stop= (ImageView) findViewById(R.id.stop);
            pause.setBackgroundResource(R.drawable.btn_playback_pause);
    
            start.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    startMusic();
                }
            });
    
            stop.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                            stopMusic();
                }
            });
    
            pause.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    isPlaying=!isPlaying;
                    System.out.println("1243544444444");
                    if (isPlaying)
                    {
                        pause.setBackgroundResource(R.drawable.btn_playback_pause);
                        rePlayMusic();
                    }else
                    {
                        pause.setBackgroundResource(R.drawable.btn_playback_play);
                        pauseMusic();
                    }
                }
            });
        }
    
        private void startMusic() {
           String nowMusic=filepath+"1.mp3";
            try {
    
                    mediaPlayer = new MediaPlayer();
    
                    mediaPlayer.setDataSource(nowMusic);//设置播放的数据源。
                    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                    //mediaPlayer.prepare();//同步的准备方法。
                    mediaPlayer.prepareAsync();//异步的准备
                    mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                        @Override
                        public void onPrepared(MediaPlayer mp) {
                            mediaPlayer.start();
                            start.setEnabled(false);
                        }
                    });
                    mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                        @Override
                        public void onCompletion(MediaPlayer mp) {
                            start.setEnabled(true);
                        }
                    });
    
            } catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(this, "播放失败", Toast.LENGTH_SHORT).show();
            }
        }
    
        private void pauseMusic() {
    
            if(mediaPlayer!=null)
            mediaPlayer.pause();
    
        }
    
        private void rePlayMusic()
        {
            if(mediaPlayer!=null)
            mediaPlayer.start();
        }
        public void stopMusic() {
            if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
                mediaPlayer.stop();
                mediaPlayer.release();
                mediaPlayer = null;
            }
    
            start.setEnabled(true);
        }
    }

### 注意，音乐文件应该放在webapp/root文件下，而不能直接放在根目录下，否则读不到。 ###

### 效果如下 ###

![这里写图片描述][20160414213754763]

### 更新 ###

1.  添加了下一首，进度条功能。
2.  解决了使用Fragment作为Item的ViewPager不更新问题.

### 使用Fragment作为Item的ViewPager不更新问题. ###

在点击下一首时，发现viewPager里面的内容不更新，查找了不少方法，找到解决方案，应该使用FragmentStatePagerAdapter。

我首先使用的是fragmentPagerAdapter.该类内的每一个生成的 Fragment 都将保存在内存之中. 也就是FragmentManager中.所以就算我刷新adapter, 它还是使用的上次缓存的Fragment. 而FragmentStatePagerAdapter的instantiateItem()则会每次都重新创建Fragment. 这样一来就每次就更新了.

### 参考链接 ###

[使用Fragment作为Item的ViewPager不更新问题. - Crazy Bird - 博客频道 - CSDN.NET][Fragment_Item_ViewPager_. - Crazy Bird - _ - CSDN.NET]

[Android– FragmentStatePagerAdapter分页 - dreamzml的专栏 - 博客频道 - CSDN.NET][Android_ FragmentStatePagerAdapter_ - dreamzml_ - _ - CSDN.NET]

### 新代码实现 ###

package com.zj.music;
    
    import android.graphics.Color;
    import android.media.AudioManager;
    import android.media.MediaPlayer;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.support.design.widget.CollapsingToolbarLayout;
    import android.support.design.widget.TabLayout;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentStatePagerAdapter;
    import android.support.v4.view.ViewPager;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.util.Log;
    import android.view.View;
    import android.widget.ImageView;
    import android.widget.SeekBar;
    import android.widget.Toast;
    
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Timer;
    import java.util.TimerTask;
    
    public class MainActivity extends AppCompatActivity {
        
    
        ImageView pause;
        ImageView start;
        ImageView stop;
        ImageView previous;
        ImageView next;
        boolean isPlaying=false;
        String filepath="http://192.168.1.130:8080/music";
        String nowMusic;
        int id=1;
        MediaPlayer mediaPlayer;
        SeekBar song_progress_normal;
        private Timer timer;
        private TimerTask task;
        ViewPager mViewPager;
        MyPagerAdapter adapter;
        TabLayout tabLayout;
    
        String autors[]=new String[]{
       "贝多芬","巴赫","舒伯特"};
        String songs[]=new String []{
       "命运交响曲","G弦上的咏叹调","圣母颂"};
    
        private static final int UPDATE = 0;
        Handler handler=new Handler()
        {
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what)
                {
                    case UPDATE:
                        song_progress_normal.setProgress(mediaPlayer.getCurrentPosition());
                        Log.i("mediaplayer",mediaPlayer.getCurrentPosition()+"");
                }
            }
        };
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            initTOP();
    
            pause= (ImageView) findViewById(R.id.pause);
            start= (ImageView) findViewById(R.id.start);
            stop= (ImageView) findViewById(R.id.stop);
            previous= (ImageView) findViewById(R.id.previous);
            next= (ImageView) findViewById(R.id.next);
            song_progress_normal= (SeekBar) findViewById(R.id.song_progress_normal);
    
    
    
    
            song_progress_normal.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                @Override
                public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                    int postion = seekBar.getProgress();
                    mediaPlayer.seekTo(postion);
                }
    
                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
    
                }
    
                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {
    
                }
            });
    
    
            previous.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (id>1)
                    {
                        id--;
                        setupViewPager(mViewPager);
                        tabLayout.setupWithViewPager(mViewPager);
                        //adapter.notifyDataSetChanged();
                        stopMusic();
                        startMusic();
                    }
                }
            });
    
            next.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    id++;
    
                    //setupViewPager(mViewPager);
                    //adapter.notifyDataSetChanged();
                    setupViewPager(mViewPager);
    
                    tabLayout.setupWithViewPager(mViewPager);
    
                    stopMusic();
                    startMusic();
                }
            });
    
    
            pause.setBackgroundResource(R.drawable.btn_playback_pause);
    
            start.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    startMusic();
                }
            });
    
            stop.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                            stopMusic();
                }
            });
    
            pause.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    isPlaying=!isPlaying;
                    System.out.println("1243544444444");
                    if (isPlaying)
                    {
                        pause.setBackgroundResource(R.drawable.btn_playback_pause);
                        rePlayMusic();
                    }else
                    {
                        pause.setBackgroundResource(R.drawable.btn_playback_play);
                        pauseMusic();
                    }
                }
            });
        }
    
        private void initTOP() {
    
            Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(mToolbar);
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    
            setTitle("音乐鉴赏");
            //使用CollapsingToolbarLayout必须把title设置到CollapsingToolbarLayout上，设置到Toolbar上则不会显示
            CollapsingToolbarLayout mCollapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
            mCollapsingToolbarLayout.setTitle("音乐鉴赏");
            //通过CollapsingToolbarLayout修改字体颜色
            mCollapsingToolbarLayout.setExpandedTitleColor(Color.WHITE);//设置还没收缩时状态下字体颜色
            mCollapsingToolbarLayout.setCollapsedTitleTextColor(Color.BLACK);//设置收缩后Toolbar上字体的颜色
    
    
            //设置ViewPager
            mViewPager = (ViewPager) findViewById(R.id.viewpager);
            setupViewPager(mViewPager);
    
    //给TabLayout增加Tab, 并关联ViewPager
             tabLayout = (TabLayout) findViewById(R.id.sliding_tabs);
            tabLayout.addTab(tabLayout.newTab().setText("请您欣赏"));
            tabLayout.addTab(tabLayout.newTab().setText("作者简介"));
            tabLayout.addTab(tabLayout.newTab().setText("歌曲简介"));
    
            tabLayout.setupWithViewPager(mViewPager);
        }
    
        private void setupViewPager(ViewPager mViewPager) {
            adapter = new MyPagerAdapter(getSupportFragmentManager());
            adapter.addFragment(DetailFragment.newInstance("请欣赏古典音乐，欲知作者与曲名可右滑"), "请您欣赏");
            adapter.addFragment(DetailFragment.newInstance(autors[id-1]), "作者简介");
            adapter.addFragment(DetailFragment.newInstance(songs[id-1]), "歌曲简介");
    
            mViewPager.setAdapter(adapter);
        }
    
         List<Fragment> mFragments;
        static class MyPagerAdapter extends FragmentStatePagerAdapter {
            private  List<Fragment> mFragments=null;
            private  List<String> mFragmentTitles =null;
    
            public MyPagerAdapter(FragmentManager fm) {
                super(fm);
                mFragments=new ArrayList<>();
                mFragmentTitles = new ArrayList<>();
            }
    
            public void addFragment(Fragment fragment, String title) {
                mFragments.add(fragment);
                mFragmentTitles.add(title);
            }
    
            public void removeAllFra()
            {
                mFragments.clear();
                mFragmentTitles.clear();
            }
    
            @Override
            public Fragment getItem(int position) {
                return mFragments.get(position);
            }
    
            @Override
            public int getCount() {
                return mFragments.size();
            }
    
            @Override
            public CharSequence getPageTitle(int position) {
                return mFragmentTitles.get(position);
            }
        }
    
    
    
        private void startMusic() {
            nowMusic=filepath+id+".mp3";
            try {
    
                    mediaPlayer = new MediaPlayer();
    
                    mediaPlayer.setDataSource(nowMusic);//设置播放的数据源。
                    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                    //mediaPlayer.prepare();//同步的准备方法。
                    mediaPlayer.prepareAsync();//异步的准备
                    mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                        @Override
                        public void onPrepared(MediaPlayer mp) {
                            mediaPlayer.start();
                            start.setEnabled(false);
    
                            int max = mediaPlayer.getDuration();
                            Log.i("mediaplayer", max + "最大");
                            song_progress_normal.setMax(max);
    
                        }
                    });
                    mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                        @Override
                        public void onCompletion(MediaPlayer mp) {
                            start.setEnabled(true);
                        }
                    });
    
                new Thread(new Runnable() {
                    @Override
                    public void run() {
    
                        timer = new Timer();
                        task = new TimerTask() {
                            @Override
                            public void run() {
                                handler.sendEmptyMessage(UPDATE);
                            }
                        };
                        timer.schedule(task, 0, 5000);
    
                    }
                }).start();
    
    
    
    
            } catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(this, "播放失败", Toast.LENGTH_SHORT).show();
            }
        }
    
        private void pauseMusic() {
    
            if(mediaPlayer!=null)
            mediaPlayer.pause();
    
        }
    
        private void rePlayMusic()
        {
            if(mediaPlayer!=null)
            mediaPlayer.start();
        }
        public void stopMusic() {
            if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
                mediaPlayer.stop();
                mediaPlayer.release();
                mediaPlayer = null;
                timer.cancel();
            }
    
            start.setEnabled(true);
        }
    }

### 效果如下 ###

![这里写图片描述][20160416112400646]

### 完成 ###

[20160414213754763]: /images/20220724/a60207df06ab464ca22a5c6e9f9dfee8.png
[Fragment_Item_ViewPager_. - Crazy Bird - _ - CSDN.NET]: http://blog.csdn.net/devilkin64/article/details/39379143
[Android_ FragmentStatePagerAdapter_ - dreamzml_ - _ - CSDN.NET]: http://blog.csdn.net/dreamzml/article/details/9951577
[20160416112400646]: /images/20220724/23ecfcabb90b4336b7f2cb2024149258.png